#ifndef __SYLAR_THREAD_H__
#define __SYLAR_THREAD_H__

#include <thread>
#include <functional>
#include <memory>
#include <pthread.h>
#include <string>
#include <stdint.h>
#include <semaphore.h>
#include <atomic>

#include "noncopyable.h"

namespace sylar{
    
class Semaphore : public Noncopyable{
public:
    Semaphore(uint32_t count = 0);
    ~Semaphore();
    void wait();
    void notify();
    
private:
    Semaphore(const Semaphore&) = delete;
    Semaphore(const Semaphore&&) = delete;
    Semaphore& operator=(const Semaphore&) = delete;

private:
    sem_t m_semaphore;

};

template<class T>
struct ScopedLockImpl{
public:
    ScopedLockImpl(T& mutex)
        :m_mutex(mutex){
        m_mutex.lock();
        m_locked = true;
    }
    ~ScopedLockImpl(){
        unlock();
    }
    void lock(){
        if(!m_locked){
            m_mutex.lock();
            m_locked = true;
        }
    }
    void unlock(){
        if(m_locked){
            m_mutex.unlock();
            m_locked = false;
        }
    }

private:
    T& m_mutex;
    bool m_locked;

};

template<class T>
struct ReadScopedLockImpl{
public:
    ReadScopedLockImpl(T& mutex)
        :m_mutex(mutex){
        m_mutex.rdlock();
        m_locked = true;
    }
    ~ReadScopedLockImpl(){
        unlock();
    }
    void lock(){
        if(!m_locked){
            m_mutex.rdlock();
            m_locked = true;
        }
    }
    void unlock(){
        if(m_locked){
            m_mutex.unlock();
            m_locked = false;
        }
    }
private:
    T& m_mutex;
    bool m_locked;

};

class Mutex : public Noncopyable{
public:
    typedef ScopedLockImpl<Mutex> Lock;
    Mutex(){
        pthread_mutex_init(&m_mutex, nullptr);
    }
    ~Mutex(){
        pthread_mutex_destroy(&m_mutex);
    }
    void lock(){
        pthread_mutex_lock(&m_mutex);
    }
    void unlock(){
        pthread_mutex_unlock(&m_mutex);
    }
private:
    pthread_mutex_t m_mutex;
};

class NullMutex : public Noncopyable{
public:
    typedef ScopedLockImpl<NullMutex> Lock;
    NullMutex(){}
    ~NullMutex(){}
    void lock(){}
    void unlock(){};
};

template<class T>
struct WriteScopedLockImpl : public Noncopyable{
public:
    WriteScopedLockImpl(T& mutex)
        :m_mutex(mutex){
        m_mutex.wrlock();
        m_locked = true;
    }
    ~WriteScopedLockImpl(){
        unlock();
    }
    void lock(){
        if(!m_locked){
            m_mutex.wrlock();
            m_locked = true;
        }
    }
    void unlock(){
        if(m_locked){
            m_mutex.unlock();
            m_locked = false;
        }
    }
private:
    T& m_mutex;
    bool m_locked;

};

class RWMutex : public Noncopyable{
public:
    typedef ReadScopedLockImpl<RWMutex> ReadLock;
    typedef WriteScopedLockImpl<RWMutex> WriteLock;
    RWMutex(){
        pthread_rwlock_init(&m_lock, nullptr);
    }
    ~RWMutex(){
        pthread_rwlock_destroy(&m_lock);
    }
    void rdlock(){
        pthread_rwlock_rdlock(&m_lock);
    }
    void wrlock(){
        pthread_rwlock_wrlock(&m_lock);
    }
    void unlock(){
        pthread_rwlock_unlock(&m_lock);
    }
private:
    pthread_rwlock_t m_lock;
};

class NullRWMutex : public Noncopyable{
public:
    typedef ReadScopedLockImpl<NullRWMutex> ReadLock;
    typedef WriteScopedLockImpl<NullRWMutex> WriteLock;
    NullRWMutex(){}
    ~NullRWMutex(){}
    void rdlock(){}
    void wrlock(){}
    void unlock(){}
};

class Spinlock : public Noncopyable{
public:
    typedef ScopedLockImpl<Spinlock> Lock;
    Spinlock(){
        pthread_spin_init(&m_mutex, 0);
    }
    ~Spinlock(){
        pthread_spin_destroy(&m_mutex);
    }
    void lock(){
        pthread_spin_lock(&m_mutex);
    }
    void unlock(){
        pthread_spin_unlock(&m_mutex);
    }
private:
    pthread_spinlock_t m_mutex;
};

class CASLock : public Noncopyable{
public:
    typedef ScopedLockImpl<CASLock> Lock;
    CASLock(){
        m_mutex.clear();
    }
    ~CASLock(){

    }
    void lock(){
        while(std::atomic_flag_test_and_set_explicit(&m_mutex, std::memory_order_acquire));
    }
    void unlock(){
        std::atomic_flag_clear_explicit(&m_mutex, std::memory_order_release);
    }
private:
    volatile std::atomic_flag m_mutex;
};

class Thread{
public:
    typedef std::shared_ptr<Thread> ptr;
    Thread(std::function<void()> cb, const std::string& name);
    ~Thread();

    pid_t getId() const {return m_id;}
    const std::string& getName() const { return m_name;}

    void join();

    static Thread* GetThis();
    static const std::string& GetName();
    static void SetName(const std::string& name);

private:
    Thread(const Thread&) = delete;
    Thread(const Thread&&) = delete;
    Thread& operator=(const Thread&) = delete;

    static void* run(void* arg);
private:
    pid_t m_id = -1;
    pthread_t m_thread = 0;
    std::function<void()> m_cb;
    std::string m_name;
    Semaphore m_semaphore;
};


}   //namespace sylar
#endif